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I I I I I I I I I I I I I I I I I I I : onDg 30 At the request of CRWCD, the Pot Hook Project configurations as defined in the USBR Definite Plan Report were used in this study. For Scenario 1 and lA the reservoir was assumed to have 60,000 AF of total capacity with only 26,000 AF active storage. For Scenario IB the reservoir was assumed to have a total storage capacity of 100,000 AF resulting in 66,000 AF active capacity. The June 5, 1959 priority date provides for 73,580 AF of storage. For this study it was assumed that the decreed amount was for active storage and therefore the June 5, 1959 priority date was applicable for all scenarios modeled. A minimum storage amount of 34,000 AF (dead and inactive storage) was assumed in the Pot Hook Project modeling. This minimum storage level was proposed in the USBR Definite Plan Report, and is required to provide the desired water surface elevation for diversions to Pot Hook Canal. This large minimum storage will incidently increase recreation benefits. Area-capacity curves, as developed by USBR, were used in the modeling (see Appendix C). During the initial investigation, Pot Hook Reservoir was modeled both with a one- fill limitation and with multiple fills permitted each year. There was insignificant difference in the results and therefore only the results from the one-fill limitation modeling runs are reported herein. Modeled project demands under Scenario 1 included storage and direct flow diversions by the Pot Hook Canal, Two Bar Canal, and the Boone and Deer Lodge Laterals. For Scenarios lA and IB only Pot Hook Canal was permitted to call on reservoir storage. In the Water Development Baseline, irrigation demands were set at 25